Pagine

What is stereo?

There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.

H.H. Scott '59

Accuphase P-250

High power output of
100 wats per channel into 8 ohms with clean sound quality at all listening
levels. This high power capability, with distortion at less than 0,1% from 20
to 20,000 Hz is fully guaranteed. Heavy duty power transistors in a parallel
push-pull drive output stage and large heat sinks back up this Accuphase
warranty.

High power
amplifiers need an especially reliable power supply that must not only provide
the energy to drive the speakers but the capacity to store and deliver adeguate
power to trace the sharpest fluctuating signal. The P-250 has just such a power
supply with an oversize power transformaer and two giant 20,000µF filter
capacitors that can easily supply the energy required to deliver 280 watts of
continuous power into 4 ohms. A severe rise in distortion when volume is reduced to low levels is a problem
with many high power amplifiers, but not so with the P-250 in which such
distortion has been eliminated to the lowest possible limit. It permits
enjoyment of clean, clear pianissimo passages at All volume levels.

The damping factor
of solid state amplifiers is generally very large and ideal for damping the
speakers. However, some speakers require en amplifier with a low damping factor
to reproduce rich, full-bodied sound. The P-250 has a Speaker Damping Control which
permits choice of three damping factors and induces maximum potential
performance from any speaker. Damping factor with an 8 ohm load becomes more than 50 when this control
is set to Normal. Likewise, it is 5 at Medium position, and 1 at at Soft
position. It enables choosing the speaker sound that one prefers.

The P-250 has a
built-in Protection Circuit which guards against damage to speakers or power
transistors in case of shorts when the speakers are connected, or when
abnormally low impedance output load connections are made. If the speakers are
shorted, this circuit automatically cuts them from the amplifier.

Large size power
meters.

Large size power
meters indicate power output in decibels (dB). The meters also provide
indications to read output power level directly in watts. Switch selection of
three ranges, 0 dB; -10 dB and -20 dB, permit both low and high power
measurement. At 0 dB reading indicates power output of 100 watts into 8 ohms
when the meter range switch is set to 0 dB.

Plenty of Input /
output terminals.

Plenty of outputs
are available to which three pairs of stereo speakers can be connected, and
switch selected. Accommodations for two pairs of input systems are also
provided, and they too can be switch selscted. One pair of input system is
provided on the front sub-panel for easy accessibility.

Specifications

Power Output (both
channel driven from 20 Hz to 20,000 Hz with no more than 0,1% THD):

140
watts per channel, min. RMS, at 4 Ω

100
watts per channel, min. RMS, at 8 Ω

50
watts per channel, min. RMS, at 16 Ω

Total
Harmonic Distortion (from 20 Hz to 20,000 Hz at any power output from ¼ watt to rated power):

4 Ω : 0,1% max.

8 Ω : 0,1% max.

16 Ω : 0,1% max.

Imtermodulation
Distortion: will not exceed 0,1% at
rated power output for any combination of frequencies between 20 Hz and 20,000
Hz